Templot Club Archive 2007-2020
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posted: 6 Apr 2018 16:32 from: Charles Warr click the date to link to this post click member name to view archived images |
I am planning to make a common crossing filing and assembly jig by milling grooves in a steel plate. In order to set the job at the correct angle on the miller I need to know the crossing angle expressed in degrees and minutes. I had assumed that like road gradients back in the good old days the ratio would be one unit vertically for x units horizontally ie the tan of the angle. However reading Iain Rice's book "Finescale Track in 4mm" he shows a diagram which uses the sine of the angle. Actually there is almost no difference between the two eg 3 minutes for a 1:8 crossing but I might as well get it right. Assistance will be appreciated. Regards Charles |
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posted: 6 Apr 2018 16:42 from: Martin Wynne
click the date to link to this post click member name to view archived images |
Charles Warr wrote: I need to know the crossing angle expressed in degrees and minutes.Hi Charles, ram_angle_diagram.png  clm_angle_diagram.png  Templot uses RAM by default. More explanation here: message 2081 To convert the unit angles to degrees, for unit angle N: RAM degrees = ARCTAN ( 1 / N ) CLM degrees = 2 x ARCTAN ( 1 / ( 2 x N ) ) You can use this trick in Templot: peg_ram_degrees.png  Set a straight turnout, shift it onto the datum so that the rails are horizontal on the screen. Press CTRL-4 twice, and on the info panel (scroll it down) read the angle in degrees for the peg. To find a different angle, press CTRL-0 (zero), change the crossing angle as required and repeat the process. For CLM equivalents, click real > V-crossing options > convert RAM to CLM menu item, and then do the above. e.g. 1:6 CLM = 1:5.96 RAM = 9.53 degrees. To convert the fractional part to minutes, multiply it by 60, e.g. for 9.53 degrees, 0.53 x 60 = 32. result: 9deg 32min. cheers, Martin. |
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posted: 8 Apr 2018 10:45 from: Charles Warr click the date to link to this post click member name to view archived images |
Hello Martin. Phew what a comprehensive reply. Useful to know that Templot uses RAM by default. Many thanks. Regards Charles | ||
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